Sack for hanging on the back of a chair



FIG. 1 is a perspective view of my sack for hanging on the back of a chair;

FIG. 2 is a front elevational view of my sack for hanging on the back of a chair;

FIG. 3 is a rear elevational view of my sack for hanging on the back of a chair;

FIG. 4 is a plane view, taken from above, of my sack for hanging on the back of a chair;

FIG. 5 is a plane view, taken from below, of my sack for hanging on the back of a chair; and,

FIG. 6 is a side elevational view taken from the left side of the sack for hanging on the back of a chair shown in FIG. 1. 

The ornamental design for sack for hanging on the back of a chair, as shown. 